Clinical research studies must be performed before any drug or medication can be approved for use and made available to the public.
There are common traits that people must have to participate in a study, called eligibility criteria. Common criteria include age, sex, medical history, and other medical conditions.
Right now, there are more than 400,000 research studies registered around the world.1
Many conditions affect diverse groups of people, so it is important to have diverse groups of people participating in research. Different people may respond differently to treatments.
